Power-unit mounting for musical instruments



G. M. RUSSELL. PUWER UNlT MOUNTING FOR MusmAL INSTRUMENTS.

\PPUCATIDN "LED DEC. 26, BIT. 1,381,666. Patented June 14, 1921.

2 SHEfTS-SHEET 1.

G. M. RUSSELL.

POWER UNIT MOUNTING FOR MUSICAL INSTRUMENTS.

1,381,666. Patentedlune 14 21.

ZSHEEYS-SHE AFPUCATIOH FILED DEC. 26. 19W.

UNITED rowan-nun: monn'rm'e FOR musrcn ms'ranmnnrs. v

STAT

as PATENT OFFiCE.

NEW YORK, assrenon T0 AMERICAN PIANO N. Y., a

CORPORATION OF NEW" JERSEY.

Specification of Letters went.

Application filed December as, 1917.

To all i0hom may concern residing in county of York,

the city Onondaga ments, tron.

This invention relates have invented an- Im Power-Unit Mountings forthat I, GUY MANLY' Bossnnn, a citizen of the United States of America,

of Syracuse, in the State of New rovement in usical Instruand of whichthe following is a specificato the mounting of a power plant inautomatic musical instruments andis particularly adapted for use ingrand piano The principal object of provide an arrangement herein shownas a power plant, an electric motor,

the invention is to of parts by which comprising and a pneumatic exhaustpump may be mounted in an inconspicuous position and so mounted that thevibrations set up during the operation of the power plant will not betransmitted to the frame of the piano in such a way audible vibrationstherein.

as to set up Other objects of the invention will be apparent from thefollowing description.

In the accompanying trative embodiment of the shown, and therein- Figuof a grand piano mounted thereon;

drawings, an illusinvention 13 re 1 is a plan view of the undersideshowing the power plant Fig. 2 is a section on the line 2- 2 of Fig. 3is a section on the line 3-3 of Fig. 1; and

Fig. 4 is a section on the line 4:"4 of fieferrin to Fig. 1 rear part 0rim or frame plant is mounted between and consists of a pneumatic 13driven the post 12, exhaust pump through a belt 15.

In automatic player struments of this character,

1 of the drawings, a grand piano is shown, wit

11 and post 12. The power the its the frame 11 and by a motor 14 pianosor other init is extremely desirable that no vibrations incident to theoperation of the power to the sounding vibrations tend port the pump 13,and audible vibrations may plant be transmitted board of the piano, assuch to destroy production of the music, provides vibration absorbingthe, effective re- This invention means to supthe motor 14 so that notbe set up in the receptacles Patented. June 14, 1921.

Serial No. 208,759.

piano as the result'of operation of its power lant.

Herein the pump 13 is mounted'betwcen the post 12 and a part of theframe 11, as shown in Fig. 1. "The pump frame is provlded withsupporting members 16 affixed to the pump casing. These S PPOrts enter17, which'ar'e mounted on the frame of-the player instrument. The holesin the receptacles are of greater size than the supports '16, and thesesupports are surrounded by a vibration absorbing material 18, which ispreferably"madeof a suitable felt. In Fig. 3 it is shown that=thesupports are entir y---surrounded b v the felt. The receptacle 17incloses the felt 18 and the supports with slight press'ure "so thatslidng of the sup orting members in the felt 1S permitted. y insulatingthe supporting members with felt, the vibrations due to the operation ofthe pump are largely absorbed and therefore not transmitted to thepiano.

Under normal conditions the frame of the pump, as represented by 13,tends to move against the supporting post 12 by reason of the belt orequivalent connection with the motor, and in order to prevent the pumpframe from moving into contact with the supporting post 12, vibrationabsorbing member or felt stop 24 is placed between the pump frame 13 andpost 12 as shown in *ig. 1. By such a means of insulation substantiallyall vibrations of the pump 13 when, under operating conditions, areprohibited from being transmitted to the frame of the player instrument.

The motor 14 is provided with a bracket 19 and supported on rods 20which in turn are supported by the members 21 attached to the frame 11and post 12. The supporting rods 20 are run through felt bushings 22 inthe ends of the bracket 19. The ends of the rods 20 are surrounded byfelt pier-cs 23, as shown in section in Fig. 4. and thereby thevibrations incidcnt to the operation of the motor are prevented frombeing trans mitted to the sounding board of the piano in such a way asto set up audible vibrations therein.

Means may be sition of the motor relatively to the pump for the purposeof tightening the driving belt the same being herein shown as a wedge 25having a vibration absorbing means 26 mounted on its inclined face. Thewedge is slidably mounted on the supportingpost 12. The Wedge may beheld in any position by suitable binding apparatus; preferably a plate-27 mounted on the post 12, and having a slot 28 therein which allows astud 29 to move in the slot and to be tightened when the wedge is inpropel-position, the stud being adapted to scre'iv'int'o the Wedge. I il It is to be understood that the present invention may be variouslymodified andembodied within the scope of :the subjoiued claims. r Y

I claim as my invention:

1. Supporting means for an electric motor comprising, in eombination, .ayoke atfixed to the motor casing, said-yoke beingprovided with bossesbored at right angles to the armature shaft of the motor; a pair of rodspassing through said bosses: vibra-' tion absorbin bushings 'for saidbosses; supports for the ends of said rods; and vibration absorbingbushings between said rods and said supports.

2. Supporting means for-an elertric motor comprising, incombination, ayoke affixed to the motor casing, said yoke being.-

. for slidably'supporting said motor from-said pump adapbed'to beslidabl; re-

ceived by said frame; vibration absorbing material interposedbetween'said extensions and said frame an electric motor; means 4 upon-'sa id frame; vibration absorbing material in-.

terposed'between the motor supports and Ftherframe; and means includingvibration ---absorbmg.means.for spacing said pump and motor uponopposite sides of a central frame member.

In testimony whereofxI have signed my name to :this specification this20th day of December, 1917.

- GUY MANLY nUssELL.

